pronunciation - GAHR-neht
Though they have the same crystal structure--cubic, like diamond and spinel--garnets are an entire group of minerals that vary in their chemical composition, resulting in a variety of gems in different colors and with different qualities. Though some varieties of red garnet are common and found on every continent on Earth, other garnets like orange spessartite and hessonite, and green demantoid and tsavorite, are much less abundant. There are more than 20 garnet species, but the five most important garnet species include pyrope and almandite (the combination of which creates rhodolite), spessartite, grossular or grossularite (which includes hessonite and tsavorite), and andradite (which includes demantoid). Garnets of all species are the birthstone for January, so January babies aren't limited to the well-known red varieties.